Name ideas for Everett's sister

We are due in [name_u]March[/name_u] with a little girl. We have a son, [name_u]Everett[/name_u] [name_u]Dean[/name_u]. We love his name so much! It is a known name, but still fresh and not very popular. We love old classic traditional names. If this baby had been a boy, his name would have been [name_m]Theodore[/name_m].
The one name we both love is [name_f]Penelope[/name_f], but we are not sure if we love how popular it is getting.
I have to say, I have read a lot of the old name lists for girls but nothing is striking me. I have always liked boyish names for girls, so maybe we should go the unusual route? Any ideas?